Dental flask



oct- 25,

1,647,048 M. D. KING i DENTAL FLASK Filed Nov. 2a. 1926 v Attorny *MALVERN 1); KING, or GA'rEsv'ILLE; TEXAS.

P -AT E NIT :OF FlC -E.

DENTAL FLASK.

Application -fi1ed November23 'l926. Serial No. 150,291. I

- coverplate, and :an intermediate ringsection.

One improvement resides in the peculiar formation of the rim of the cup which is comparatively low at the front and includes spaced and elevatedcheek portions at the rear. The advantage of this c'onstructionis important in that the front part bernglow allows the investment of the model to be straight, and accommodates the necessary rise in the heel portion of the model at the rear. b

An equally important feature in construction, is the provision of a pair of substantially V-shaped depending tongues carried by the ring section and receivable in correspondingly shaped grooves formed on the outer periphery of the base or cup section, the portions being such as to allow for proper adjustment and to prevent relative turning movement.

Other features and advantages of the invention will become apparent from the. following description and drawings.

In the accompanying drawing forming a part of this applicatiomand inavhich l ke numerals are employed to designate like parts throughout the same Figure 1 is a top plan view of a dentalflask constructed in accordance with the present invention. 7

Fig. 2 is a side elevation of the same. Fig. 3 is a bottom plan view, and Fig. 4 is a central vertical section.

Referring to the drawings in detail, it

will be seen that the reference character 1 designates the base which, as before stated, is of custimary cup-shaped design, and includes a flat bottom having an upstanding marginal rim which includes a comparatively low front portion 2 and a palr of elevated cheek or heel portions 3. These heel portions serve to accommodate the rise that must be made in the heel portion of the model, and this makes the mold set level and prevents breaking. g

If the side or the rim was the same height all the way around when the modelwas in vested, it would haveto be tilted because the heel must be invested deeper than-the front, and bythe presence of the elevated cheek portion :3, this construction of model is permitted and this is a -decided advance in the art of making dentures. 1

In connection with this part of thestructure, I would direct attention to the opposite thickenedportion 4 -on the outer surface of the rim which =aidsi 1 i--defining-one sideof a V-shaped groove 5. The-otherside is formed by one portion of a rib 6 which 'cooperateswvith another rib 7-1informing a seat for a section of .aclarnping bolt or the like. The under sideslof these ribs? are cut away asindicated at 8 to accommodate th e=clamping bolt head. I p 1 The intermediate ring-like portion is represented by the reference character 9 and has its lower edge shaped to correspond to the shape of the .rim of the cupped base. At spaced points, this is provided with outstanding ribs 10 which cooperate with the aforesaid ribs 6 and 7 in further completing the seats or confining means for the clamping bolts (not shown).

It will also be noticed that the metal of the part 9 is thickened at opposed points as at 11 and formed into outwardly offset and depending V-shaped tongues 12 which extend down into the aforesaid V-shaped grooves 5. This arrangement permits relative adjustment of the sections of the flask in a vertical direction and yet prevents relative rotary movement. The top edge of'the section .9 is flat and straight for reception of the removable cover 13. It will be n0- ticed that this cover is of the same configuration as the separable sections of the flask and the same is provided on its under side with centrally disposed reinforcing rib 14 to prevent buckling and the end portions of this rib are removably seated in notches formed in the upper edge of the section 9.

Moreover at spaced points, outstanding ears 15 are provided for cooperation with the ribs 7and'l0. While these details imply the necessity of using clamping bolts, it is of course understood that the structure may be used without bolts in a flask press. In fact, the rib and groove formation makes the device very desirable to be used in a vulcanizer that has the flask press attached such as for instance, the Edison type of vulcanizer.

The V-shaped grooves and correspondingly shaped tongues are longer than similar parts on the flasks, now on the market. This allows the two separable parts ofthe flask to be put in opposition to one another, while yet wide apart, and when pressed down, the grooves and tongues will force the two parts into proper normal position. Another feature of this construction is that it allows a forward movement to accommodate an undercut on upper model, to accommodate an irregular model at the time the'two pieces are placed to one another, but when it is drawn down and closed in the press, the tongues and grooves will carry the model and investment back to its normal position.

Obviously, the advantage of the forward movement is to prevent'too much pressure on the forward part of the model and this lessens the danger of breaking the model.

These and other advantages and features of the invention have doubtless been made apparent from the description and drawings. Therefore, a more lengthy description is thought unnecessary.

While the preferred embodiment of the invention is shown and described, it is to be understood that minor changes coming within the field of invention claimed may be resorted to if desired.

Having thus described my invention, what I claim as new is A dental flask comprising a base section including a flat bottom having a marginal upstanding flange including a comparatively low front portion, and correspondingly low side portions merging into a pair of raised cheek portions disposed substantially diametrically opposite to said front portion, the side portions of said rim being thickened somewhat at the juncture thereof with said cheek portions, and being provided with vertically extending V-shaped grooves, the 

